n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 3 |
5 | 6 |
6 | 20 |
7 | 45 |
8 | 116 |
9 | 385 |
10 | 2224 |
11 | 6396 |
12 | 23708 |
13 | 88065 |
14 | 445784 |
15 | 3962502 |
16 | 14478825 |
17 | 64495508 |
18 | 309085415 |
19 | 1608099881 |
20 | 10856426344 |
21 | 142802148953 |
22 | 604464533847 |
23 | 3324499738872 |
24 | 17795211310951 |
25 | 112537384959231 |
26 | 718232376832560 |
[1,1,1,2,3,6,20,45,116,385,2224,6396,23708,88065, 445784,3962502,14478825,64495508,309085415, 1608099881,10856426344,142802148953,604464533847, 3324499738872,17795211310951,112537384959231, 718232376832560] |